Kowal Dominik, Urbanczyk Waclaw, Mergo Pawel
Department of Optics and Photonics, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland.
Laboratory of Optical Fiber Technology, Maria Curie-Sklodowska University, 20-031 Lublin, Poland.
Sensors (Basel). 2018 Mar 20;18(3):915. doi: 10.3390/s18030915.
In this paper we present an all-fiber interferometric sensor for the simultaneous measurement of strain and temperature. It is composed of a specially fabricated twin-core fiber spliced between two pieces of a single-mode fiber. Due to the refractive index difference between the two cores in a twin-core fiber, a differential interference pattern is produced at the sensor output. The phase response of the interferometer to strain and temperature is measured in the 850-1250 nm spectral range, showing zero sensitivity to strain at 1000 nm. Due to the significant difference in sensitivities to both parameters, our interferometer is suitable for two-parameter sensing. The simultaneous response of the interferometer to strain and temperature was studied using the two-wavelength interrogation method and a novel approach based on the spectral fitting of the differential phase response. As the latter technique uses all the gathered spectral information, it is more reliable and yields the results with better accuracy.
在本文中，我们提出了一种用于同时测量应变和温度的全光纤干涉传感器。它由一段特殊制造的双芯光纤拼接在两段单模光纤之间组成。由于双芯光纤中两个芯之间的折射率差异，在传感器输出端会产生差分干涉图样。在850 - 1250 nm光谱范围内测量了干涉仪对应变和温度的相位响应，结果表明在1000 nm处对应变的灵敏度为零。由于对这两个参数的灵敏度存在显著差异，我们的干涉仪适用于双参数传感。使用双波长询问方法和基于差分相位响应光谱拟合的新方法研究了干涉仪对应变和温度的同时响应。由于后一种技术使用了所有收集到的光谱信息，因此更可靠且能以更高的精度得出结果。
